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We show for the first time that FBQS J1151+3822 is an iron low-ionizationbroad absorption line quasar (FeLoBAL QSO), the second-brightest andsecond-closest known example of this class. He I* and Fe II together act as aneffective analytical tool, allowing us to obtain useful kinematic constraintsfrom photoionization models of the outflow without needing to assume anyparticular acceleration model. The main outflow's log ionization parameter is-1.5, the log hydrogen density [cm^(-3)] 5.5 to 8, the log hydrogen columndensity [cm^(-2)] 21.7 to 21.9, the absorption radius 7.2 to 127 pc, and thekinetic luminosity 0.16% to 4.5% of the bolometric luminosity. We obtainline-of-sight covering fractions of ~0.25 for strong Fe II, ~0.5 for He I*, and~0.6 for Mg II. Narrower and shallower absorption lines from weaker Fe II andMn II with outflow velocity ~3400 km/s have appeared between 2005 and 2011,suggesting that dense cores may have condensed inside the main outflow.Consideration of the literature might suggest that the FBQS J1151+3822 outflowis a member of a rare and distinct sub-class of FeLoBALs with high densitiesand correspondingly small absorption radii. We find, however, that suchoutflows are not necessarily a distinct sub-class, and that their apparentrarity could be a symptom of selection bias in studies using density-sensitivelines.

Tracing the Outflow of a z=0.334 FeLoBAL: New Constraints from Low-Ionization Absorbers in FBQS J1151+3822